by tim Sat Sep 08, 2012 9:15 am
both are correct - kind of. "had had" means your heart attack occurred before something else you and the doctor discussed. since we don't know of this prior event from the context, this would technically be an incorrect GMAT sentence, but if used with additional context it would be fine. "have had" means you had the heart attack recently and are likely still feeling the effects of it..
Tim Sanders
Manhattan GMAT Instructor
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